Don’t go in a reconnect loop on host-unknown

That can DoS the server. D:

• Changesets:
  • Revision 11b193fb by mathieui on 2016-08-20T11:13:23Z:

Fix #3219, Fix #3220 (no connection loops on some stream errors)

Do not reconnect if the stream error is a conflict or an host-unknown;
also add a sleep(1) in order to not DoS the server if it loops on other
conditions.